作者:Ali Kh. Al-Matar、Bassam El-Eswed、Maha F. Tutunji
DOI:10.1002/kin.20307
日期:2008.6
potent proton pump inhibitor, were investigated in the presence of 2-mercapotoethanol. Reactions were monitored in solutions buffered to pH values ranging from 2.0 to 5.0 using differential pulse polarography at the static mercury drop electrode. First-order reaction network was proposed for all conversions. It is demonstrated that acid degradation predominates at pH values ∼2–3, whereas the reaction
在 2-巯基乙醇存在下研究了奥美拉唑(一种有效的质子泵抑制剂)的反应。在静态汞滴电极上使用差分脉冲极谱法监测缓冲至 pH 值范围为 2.0 至 5.0 的溶液中的反应。为所有转换提出了一级反应网络。结果表明,酸降解在 pH 值 ~2-3 时占主导地位,而次磺酸与更具亲核性的硫醇的反应在 pH 值约 4-5 时变得突出。酸性介质是形成次磺酸所必需的,次磺酸是被认为是活性抑制剂的关键中间体,但酸也会将该次磺酸转化为其他对硫醇不反应的降解产物。目前的工作表明,酸抑制可能发生在高于先前认为的 pH 值的情况下。因此,“需要高酸性介质来实现奥美拉唑在壁细胞中的积累和活化,但亚磺酸中间体与 H+/K+-ATPase 质子泵的半胱氨酸残基的巯基反应需要弱酸性介质。活体。” © 2008 Wiley Periodicals, Inc. Int J Chem Kinet 40: 352–358, 2008